US5746617A - Self aligning coaxial connector assembly - Google Patents
Self aligning coaxial connector assembly Download PDFInfo
- Publication number
- US5746617A US5746617A US08/674,882 US67488296A US5746617A US 5746617 A US5746617 A US 5746617A US 67488296 A US67488296 A US 67488296A US 5746617 A US5746617 A US 5746617A
- Authority
- US
- United States
- Prior art keywords
- connector
- coupling member
- coupling
- movement
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
- H01R13/631—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only
- H01R13/6315—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for engagement only allowing relative movement between coupling parts, e.g. floating connection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
Definitions
- This invention relates to electrical connectors, more particularly, is directed towards self-aligning, pluggable connectors for electrically coupling two components in an electrical circuit assembly.
- Pluggable electrical connectors have applications in many electronic environments for such uses as connecting component modules to mother boards, connecting component modules to other component modules, as well as various other electronic systems packaging configurations. Pluggable connectors permit rapid access to the individual components for maintenance or repair functions. Such connectors are particularly desirable for use in "blind connector” applications in which a plug-in type module or chassis is generally connected at a rear face thereof to a recessed, or other substantially inaccessible location in a rack system or similar component.
- One type of coaxial connector assembly is shown in U.S. Pat. No. 4,426,127.
- Coaxial cabling typically consists of a central conductor material surrounded by an outer conductor material. While the central conductor material generally is a wire, the outer conductor typically is formed by braiding fine metallic threads. The central and outer conductors are separated by a non-conductive, dielectric material. An outer jacketing material can be employed to protectively encase the outer conductor material. To achieve maximum electrical efficiency, the cable segments must be axially and angularly aligned to high precision, as well as placed in mutual contact. The alignment and spacing requirements are exceedingly demanding due to the minute size of the inner conductor material.
- This common RF connector is sufficient for many applications such as those involving relatively few connections where individual coaxial cables connect directly to chassis mounted bulkhead or plug interfaces and in which convenient access to the connector interfaces is available. In such applications, mechanical alignment compliance and tolerances associated with each independent connector interface are non-issues and adequate operation is nominally assured.
- One such connector assembly suffers from the disadvantage that the male and female connectors are moved laterally into longitudinal alignment while the male and female connectors are being urged together in a longitudinal direction. Some of these designs have difficulty operating reliably over their intended frequency bands due to mechanical features thought essential for alignment and engagement purposes. These features also tend to make them relatively expensive.
- a female connector assembly for coupling with a cable to a male plug assembly.
- the connector includes a coupling collar adapted to receive the male plug assembly in mating engagement therewith.
- the connector also includes a housing adapted to movably support the coupling collar such that the coupling collar is movable in a substantially orthogonal direction relative to the coaxial direction to facilitate the mating engagement.
- An urging member is provided to urge and hold the female connector and male plug in tight mating engagement.
- the movability of the collar in the orthogonal direction serves to compensate for misalignment of the connector relative to the male plug assembly for precise mating engagement of the male plug and female connector embodying the invention.
- FIG. 1 is a partially broken away, partially cross-sectioned, exploded elevational side view, with portions shown in phantom, of a coaxial connector assembly of the prior art
- FIG. 2 is a partially cross-sectioned, exploded elevational side view of portions of a connector assembly embodying the present invention
- FIG. 3 is an enlarged cross-sectional elevational side view of a connector of the present invention.
- FIG. 4 is a perspective view of a portion of the connector of FIG. 3;
- FIG. 5 is a partially cross-sectional, exploded elevational side view of portions of a connector assembly embodying the present invention, during a step in the operation thereof;
- FIG. 6 is an enlarged, cross-sectional, elevational side view of the connector assembly of FIG. 5 during a further step in the operation thereof;
- FIG. 7 is an enlarged, elevational side view of a connector assembly embodying the present invention, with portions thereof shown in phantom, during the step in the operation thereof of FIG. 6;
- FIG. 8 is a reduced scale, elevational side view of a connector assembly embodying an alternate embodiment of the present invention.
- the present invention comprises a connector 50 (FIG. 3) for electrically coupling a coaxial cable 18 (FIG. 2) to a complementary connector assembly or male plug assembly 4 (FIG. 2).
- Connector 50 includes a coupling member or coupling collar 20 which is disposed within, and slidable relative to, a stationary housing 33 (FIG. 3) to enable coupling collar 20 to move in a substantially unrestricted fashion in a direction generally orthogonal or transverse to its central axis or theoretical centerline 19.
- This freedom of movement enables the connector 50 to self adjust during engagement with male plug assembly 4 to compensate for any misalignment therewith. In this manner, any such misalignment is compensated nominally without introduction of orthogonal stress or strain to the mating componentry. This serves to reduce failures due to connector breakage and to promote enhanced electrical contact between connector 50 and male plug assembly 4 for improved connector performance.
- a conventional threaded RF connector 40 includes male connector or male plug assembly 4 and mating connector or female connector 42.
- a transmission line 1 extends within a chassis 3 into, and is engaged by, male connector 4.
- the male connector has a theoretical centerline or axis 2 which is coaxial with the portion of the transmission line engaged by the male connector.
- Male connector 4 is fabricated from an electrically conductive material such as a suitable metallic alloy and typically includes conventional signal transferal features, such as a metal contact socket 7, insulator 6 and metal contact face 5. Additional features of the male connector include an external thread 9 and internal bore 8, both of which are substantially coaxial with theoretical centerline 2.
- Conventional mating connector 42 includes a shell 13, with metallic center pin 10, contact face 12, transitional diameter 9, and insulator 11.
- Coupling nut 16, with internal thread 15 is fastened by retaining ring 14 to shell 13 to allow free rotation of coupling nut 16 about an axis nominally coaxial to both shell 13 and theoretical centerline or axis 19.
- a seal ring 17, which operates in a manner familiar to one skilled in the art, may be included in the assembly but does not affect electrical performance directly.
- Transmission line 18 is engaged by shell 13 in any of various methods of attachment known to one skilled in the art. The portion of the transmission line which is so engaged is coaxial with theoretical centerline 19. As shown in phantom, transmission line 18a is a right angle variation of transmission line 18 which may, in general, afford a more compact implementation for some typical applications.
- the present invention includes a coupling collar 20, in lieu of coupling nut 16 of the prior art.
- Coupling collar 20 includes a smooth cylindrical bore 23, having a lead frusto-conical section or cam surface 22 and radial flange 21 of predetermined thickness 25, which will be discussed in greater detail hereinafter.
- Radial flange 21 also includes an engagement surface 46 which defines an orthogonal plane 24. Remaining features shown are substantially similar to those described hereinabove with respect to FIG. 1. If centerlines 2 and 19 are maintained in substantially coaxial orientation and sufficient longitudinal or axial force is applied to surface 46 of radial flange 21, suitable mechanical contact will occur at contact face 5 (FIG. 1) of male connector 4 and contact face 12 of shell 13 to provide satisfactory electrical performance, as will be discussed in greater detail hereinafter.
- Connector 50 further includes a substantially planar centering washer 29, for example, a centering ring, ring 29 having a recessed bore 28 of predetermined diameter 52, depth 30 and which terminates at terminal surface 48.
- Centering ring 29 is oriented so that plane 24 represents the coplanar position of surface 46 of radial flange 21 and engagement surface 48 of centering ring 29.
- Centering ring 29 is provided with an outer diameter 31 of predetermined size so as to slidably and concentrically fit within a bore 32 of a stationary housing 33.
- a retaining washer 34 is rigidly captured by any suitable means (not shown) in stationary housing 33 to retain centering ring 29 and coupling collar 21 within bore 32.
- a longitudinal or axial spring force 35 urges centering ring 29 towards an initial longitudinal position in engagement with retaining washer 34 as shown.
- coupling collar 20 is resiliently supported within stationary housing 33, such that collar 20 is provided with freedom of movement in the axial direction relative to stationary housing 33 against the bias of axial spring force 35.
- radial flange 21 of coupling collar 20 is provided with a predetermined thickness 25 and diameter 26, and bore 28 is provided with a predetermined depth 30 and diameter 52, to provide sufficient axial clearance for flange 21 to slide freely in the orthogonal directions between centering ring 29 and washer 34 when the centering ring is disposed in its initial longitudinal position as shown.
- Diameters 26 and 52 are dimensioned so as to permit the collar 20 to move a predetermined clearance distance 27 in any orthogonal direction from the concentric positions of centering ring 29 and collar 20 as shown. This construction thereby serves to effectively confine coupling collar 20 within bore 28, while enabling coupling collar 20 freedom of substantially unrestricted orthogonal movement relative to centering ring 29, within a predetermined range of movement defined by the difference between diameters 26 and 52.
- the present invention therefore permits substantially unrestricted orthogonal movement to compensate misalignments nominally without application of orthogonal stress or potential energy to components of connectors 4 and 50 as a result of the mating engagement.
- Theoretical centerline 19 of collar 20 is thereby conveniently permitted to assume an essentially parallel, but non-coaxial, position relative to bore 32 of stationary housing 33, as will be discussed in greater detail hereinafter with respect to FIG. 5.
- collar 20 and centering ring 29 are permitted to tilt or cant against the bias of spring force 35 to a position in which theoretical centerline 19 is disposed at an oblique angle with respect to an actual centerline 38 of bore 32 as shown in FIG. 7 and as will be discussed hereinafter. Accordingly, the present invention thus effectively provides coupling collar 20 with freedom of movement in substantially any direction for movement as a "free body" relative to stationary housing 33, to facilitate mating engagement while nominally eliminating application of stress or potential energy on connector components in the orthogonal direction. This will become more apparent with respect to the operation of the present invention discussed hereinafter.
- centering ring 29 is provided with a slot 36 to facilitate assembly relative to transmission line 18 in a manner which will be familiar to one skilled in the art.
- chassis 3 and concomitantly, plug assembly 4 is oriented so that theoretical centerline 1 is generally axially aligned with actual centerline 38 of stationary housing 33.
- This general alignment may be provided by any common alignment means, such as conventional guide pins 56 (FIG. 8) engaged with mating bores 58 (FIG. 8).
- the present invention requires only a relatively minimal axial force, namely, one that is sufficient merely to maintain electrical unification of faces 5 and 12.
- continued mating movement of chassis 3 toward stationary housing 33 serves to deflect coupling collar and centering ring 29 relative to bore 32 (see FIG. 7) against the bias of spring force 35, to thereby bring spring force 35 to bear directly upon contact faces 5 and 12 to help ensure that connectors 4 and 50 are electrically unified.
- This deflection also serves to advantageously compensate for longitudinal tolerances in connectors 4 and 50.
- Connectors 4 and 50 thus reach a fully mated position after occurance of such deflection. This fully mated position may be indicated by conventional means such as engagement of guide pins 56 within mating bores 58 having stops 60 as shown in FIG. 8.
- the fully mated position of the cable assembly embodying connector 50 of the present invention may be achieved in spite of inherent non-parallel alignment of actual centerline 38 of bore 32 and theoretical centerline 19.
- the freedom of movement accorded coupling collar 20 by the construction of the present invention permits contact faces 5 and 12 to fully engage one another in full surface to surface contact, regardless of the inherent non-parallel orientation of center lines 2 and 19 as a result of, for example, manufacturing tolerances.
- the above described "free body" construction enables the substantially planar centering ring 29 to move against the bias of spring 54 (FIG. 8) to an oblique angle ⁇ relative to actual centerline 38 of bore 32.
- an alternate embodiment of the present invention includes the use of a plurality of connectors 50 disposed on a stationary housing 133 to matingly engage corresponding plug assemblies 4 disposed on a chassis 103.
- Guide pins 56 and corresponding mating bores 58 and stops 60 may preferably be employed as described hereinabove.
- the subject invention presents a means of accomplishing mechanical blind mating at relatively low cost, without compromise to RF performance by employing a relatively simple construction using many traditional RF components and eliminating the need for relatively high manufacturing tolerances. Further, this invention presents a means of connection in which freedom of movement in an orthogonal direction is provided to compensate for any misalignment while nominally preventing the generation of any orthogonal preload or stress within the connector componentry. Further still, the subject invention presents a means of connection in which typical right angle devices may be utilized.
Abstract
Description
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US08/674,882 US5746617A (en) | 1996-07-03 | 1996-07-03 | Self aligning coaxial connector assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US08/674,882 US5746617A (en) | 1996-07-03 | 1996-07-03 | Self aligning coaxial connector assembly |
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US5746617A true US5746617A (en) | 1998-05-05 |
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US08/674,882 Expired - Fee Related US5746617A (en) | 1996-07-03 | 1996-07-03 | Self aligning coaxial connector assembly |
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US6344736B1 (en) * | 1999-07-22 | 2002-02-05 | Tensolite Company | Self-aligning interface apparatus for use in testing electrical |
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